Improvement in scroll-saw mills



Whesses:

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0A. 2. ILY. (USBORN E'S PRDCESSY UNITED STATES PATENT OFFICE.

IMPROVEMENT IN SCROLL-SAW MILLS.

Specification forming part of Letters Patent No. 38,47 l dated May l2,1863.

To all whom it may concern:

Be it known that I, W. H. DOANE, of Cincinnati, in the county ofHamilton and State of Ohio, have invented a new and Improved Scroll-SawMill; and I do hereby declare that the following is a full, clear, andexact description thereof, reference being had to the accompanyingdrawings, making a partof this specication, in which- Figure lis a frontelevation of my improved machine. Fig. 2 is a side elevation of thesawbed and a vertical diametrical section through the adjustableguide-tube, showing the arrangement of the saw-guide within the same.Fig. 3 is aloottom view of the bell-mouthed pressure-foot and the tubewhich holds the guide for the saw.

Similar letters of reference indicate corresponding parts in the threefigures.

This invention relates to certain new and useful improvements in hangingand operating that class of straight saws which are intended especiallyfor sawing scroll-work, and which must be hung in rm and substantialguides, which will prevent the saw-blades from being broken or bucklingout of shape in their rapid reciprocating motion,

The nature of my invention consists in giving an alternate reciprocatingmotion to the saw-blade when it is hung in a particular manner by meansof an eccentric, which receives its motion from any suitable primemotor, and which works within a yoke which is connected directly to thelower saw-guide, thus dispensing with the usual pitman-driver and itsattendant objections, and giving a more steady and positive motion tothe saw-blade than hitherto, as will be hereinafter described.

It also consist-s in guiding the saw and keeping it stift' by means of arod having a longitudinal groove cut into it of Va suitable depth toreceive the saw-back, said rod being secured and rigidly retained withinan adjustable tube or holder, as will be hereinafter described.

It also consists in a novel device for holding the guide-tube over thework and allowing said tube to be adjusted and set in any de-` siredposition, as will be hereinafter described.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

In the accompanying drawings, A represents the standard, and A the tableupon which the stuff to be sawed is placed. B is a horizontaldriving-shaft which passes through the standard A and carries on one enda loose belt-pulley and a fixed belt-pulley, a', as shown in Fig. 2 ofthe drawings. On the opposite end of the shaft B an eccentric disk, O,is keyed fast, which has an annular groove in its periphery, andencompassing the grooved eccentric C is a yoke, O', which is madeof twoportions bolted together at their ends by the screw-bolts b b. (Shown inFig. l of the drawings.) The motion of the yoke C is in a verticalplane, which-is at right angles to the horizontal plane of the shaft B,and this yoke is kept in its place within the annular groove in theeccentric O and allowed to receive a vertical reciprocating motion whichis communicated to it by the eccentric. The yoke C carries the squareguide-rod D, which is perpendicular to and in a vertical plane with theaxis of the driving-shaft B. c c are two guide-blocks for the rod D,which blocks, are secured to the standard A, one above and the otherbelow the yoke O. By this arrangement a reciprocating motion can becommunicated to the guide-rod D by rotating the driving-shaft B, and itwill be seen that the eccentric C, being keyed to a shaft which is in aplane perpendicular with the guide-rod D, will give a positive motion tothe guide-rod, and thus there will be no vibrating nor wabbling motionof this guiderod in its boxes c c.v The lower end of this saw-blade d issuitably connected to the head of the guide-rod D under the table A',and this saw projects up through a slot which is made through the tableA', and is connected at its upper end to the solid piston e when it isdesired to use this piston; but when the piston is not used the upperend of the saw is not affixed to anything. The saw-blade d is guided andstiffened above the table A by means of a steel rod, E, which has a deepgroove cut into it in a direction with its length to receive the back ofthe saw-blade and to allow the saw to work freely, and at the same timeto be held in such a manner that it will not receive any twistingaction. The guide-rod E is secured concentrically within an adjustableholder, F, or it may be arranged out of the center ,of this holder ifnecessary, as will be hereinafter described. The holder consists of ahollow tube, F, having an acorn-shaped cap, f, screwed into its upperend for holding the upper end of the guide-rod E, and a circular plate,j", screwed into its lower end for receiving and holding the lower endof this guide E, as shown in Fig. 2 ofthe drawings. Ihe lower plate, f',of

tube F has an oblong slot cut through it for allowing the saw-blade d topass through it, and when the piston e is used two holes, p p, are madethrough this plate f', one on each side of the saw-slot for the escapeof a blast of air, as shown in Fig. 3 of the drawings. The tube Fcarries on its lower end a flaring or bell-mouthed portion7 H, with twoopenings in its sides, and with a smooth, flat bottom. This flaringportion H is intended for holding the stuff down on the table on eachside of the saw during the operation of the saw, its wide base beinggiven to it for this purpose. The spaces in each side of this holder Hadmit ofthe escape of sawdust and also allows the sawyer to examine hiswork. The tube F is supported from a fixed pendant, I, which is securedto some fixed object above the machine by means of alaterally-adjustable plate or bracket, J, and a split collar, J', whichlatter is secured to the bracket J by a wrist-pin, k, which can be setup so as to fix the collar J rigidly to the bracket J or loosened foradjusting this collar, as occasion may require. The split collar Jembraces the tube F, and it can be made to hold this tube fast by meansof the pinching screw j, which is tapped through the ears on each endofthe collar, and when this screw j is tightly set up the ends of thecollar are drawn together and the collar is made to embrace the tubermly. By loosening the screw j the collar will expand, and the tube Fmay be adjusted either up or down and again iiXed atany desiredelevation from the table A. The object of this latter adjustment is toadapt the bell-mouthed holder H to stuft' of varying thickness. Thescrew-pin 7c, which connects the collar J to the angular plate J, whenloosened allows the tube to be adjusted to suit any rake which it isdesired to give the saw, and when this screw 7c is set up tightly thejoint is fixed rigidly to the plate J. The inode of adjusting the plateJ is by cutting two oblong slots, l l, through it parallel with eachother and then securing the plate to the side of the xed pendant I bymeans of screws m m, passing through the slots l l. NVhen the screws m mare loosened, the plate J, and the tube F, which it carries, can beadjusted laterally and fixed at any desired point by setting up thesescrews again.

I have represented in the sectional view, Fig. 2, a solid pistonattached to the upper end of the saw by means of pins, one above and theother below the piston, which pass through the saw and secure the pistonto it.

This piston may or may not be used, at the pleasure of the operator; butwhen it is used a perforation is made through the cap f for the freepassage of air into and out of the tube F, as the pistou reciprocates inthis tube. Two perforationsfp p, are also made in the plate j", one oneach side ot' the saw d, for the purpose of conducting blasts of airdown on the work in the descending strokes of the saw, and thus blowingaway the sawdust from the stuft' which is being sawed. However, as Isaid before, this blast attachment may be dispensed with, aud the pistoue removed from the tube F, as this piston is not at all necessary to theperfect controlling and guiding of the upper end of the saw in itsreciprocating movement.

To operate the machine, a belt which com municates with some prime motoris passed over the iixed pulley a. on shaft B, andthe rotation of thisshaft transmits a vertical reciprocating motion to the guide-rod Dthrough the medium of the grooved eccentric C and its yoke C. The saw d,being attached to the upper end of this guide-rod D, receives its motiontherefrom, and this saw is guided in its motion by means of the slottedsteel rod E, which, being fixed rigidly within the tube F, keeps the sawin its place, and serves the twofold purpose of a back as well as a sideguide for the saw. Then, again, the tube F, being made adjustable inalmost any direction, the operator can give any desired adjustment tothe saw and tube either to adapt the flaring foot of the tube to thethickness of the stuff placed on the table, or to set the saw at anydesired angle to compensate for the rake in the saw, giving (during allthese adjustments) the back of the saw a rm support in its steelguide-rod, at whatever angle the tube F is set.

I do not desire to lay any claim to the piston e, nor to its combinationwith any of the parts which I have above described, as I desire thatthis piston arrangement shall form the subject of a separateapplication, which I shall hereafter make.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

l. The metal guide-rod E, in combination with the lower support, j" andthe upper support, f, or the equivalents thereof, substantially in themanner described.

2. Supporting and guiding the upper end of the saw d in the metal rod E,the latter being fixed within an adjustable tube, F, substantially asdescribed.

3. The combination, with the adjustable tube F, of the flaringbell-mouthed holder II, as herein described.

- 4. The elastic clamping-collar J, in combination with the adjustabletube F and metal guide-rod E, as and for the purposes described.

5. The combination of the tube F, elastic collar J adjustable slottedplate J, and pivot connection 7c, substantially as and in the manmotionto the guide-rod and dispensing with ner described. the pitman-driver,substantially as herein de- 6. Making the upright yoke rod thedrivingscribed. rod for the saw, and guiding this rod in its motions bymeans of two or more guide-boxes arranged above and below the yoke C',the Witnesses: Whole being combined with the eccentric C and saw d, forgiving a positive rectilinear WM. H. DOANE.

W. L. ALDRIGH, J A0013 B. WYMAN.

